I have one comment, though. When you zoom in, the Google Maps API doesn't display roads, only railroads. This makes interpretation in rural areas difficult, since towns are often spaced widely apart. Also here in the US we are used to seeing things against an overlay of road networks. If this can be fixed or enabled as an option, it would help a lot.

Roads have been disabled, because sometimes it looks too confusing in combination with the stroke markers. However, we've now enabled the roads for the normal map. In a future version, we will provide an additional option to toggle the roads individually (already on the to-do list).